Spark-plug.



J. M. WALTON.

SPARK PLUG.

APPLICATION FILED lULY 25.1915.

. Patented June 6, 1916 gwum H01 JOHN wALrori; or NEw'oRLnANs;"Louisiana,"

' SPARK-PLUG.

mes :42.

To aZlwkom it may concernz' g Q Be it known that I, JoHNyM. W LT oN,

a citizenof the United Statesg residing at New Orleans, in theparish- 'of Orleans'and State of Louisiana, have-inventedcertainf new and useful Improvemen'tsin. Spark. Plugs, of which the following is a rspecifi-j cation, reference being had thereinto thesis companying drawing. 7 I v My present invention relates to unprovements in spark plugs and more; particularly to that type shown in my Letters Patent No. 1,132,811, dated -March 23, 19 15, ;bn object of the present invention beingithe provision of means whereby'that portion of the insulator inclosed within the metaljcasing may be readily cleaned withoutdismantling the parts, such casing" codjperating'ftvith a I supporting bushing whichafter once 'assem-f blingwitliin the engine does not have to 'be removed.

A further object of 'the pi'esent invention y is the provision of a cuttin edge upon the insulator carrying casing-w erebyany col-- lection of carbon within the "supporting bushing will be automaticallylremoyed as the insulator carrying casing is moved mtof and out of position.

' With the foregoing view which will appear "as the descriptioni proceeds, the invention resides in the com bination and arrangement ofparts and In the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment, of the invention herein disclosed can be made within the scope of what is claimed without do- I parting from the spirit of the inventionl meral 1 designates the supporting bushing provided with the exterior screw threads 2 and with the double diameter-ed portions 3 and 4t providingthegasket receiving shoulder 5, for the reception of the metal ring gasket 6.

Specification of Letters Patent.

and otherttjcts in.

I Application filedplfuly 1 5, 19 Serial No. 46,063..

' Patented Jones, 1916;

' T11 i nsulatorv, carrying casing v1c led w1th the frustoconical ,spa'rking end8 iv having the concentricchanhelS in fcommuni Cation with the chamber 10.. 11 1s formedin' the wall of the Anv opening casingfZ' and thus permits access to: the chamber l'Q-andi l o. rte th lower e d of t The shoulder .12 ofthe to I-rest upon thegasket 6'withthethreaded portion 13- engaging the "threaded portion? 1 14 of they-bushing 1, -.the portion Hvof the a providing a wrench 1 engaging en'd W insulator- 17," thus pergnitting these parts to be thoroughly": g cleansed without dismantlingthe'insulator:

casing '74 is adapted terbo redft'o provide the shoulder 15 for "the" recepti omof the annular shoulder-16 of the.

reception of the fixed disk '21' carried by the.

v insulator 1f? the shoulder :18 1 of the insula-' being; held seated andaproperlyrlocked n place-by means of the loc'kin'g'bu'shing 19 .Theinstilatdr; is :providedswith the bore 23j'terminatingtin. the chamber 20 for-then stem 22; said-stem 22Iex'tending through th bore-23, and being; .providedmiththe re 1. duced end '24: which extends'thrdugh' the? casing 10 andopening 9/;thereof1to a point below the sparkingterminali30. .The spark-'- 1 mg disk 25 is riveted at 26' upon; thellowerwend of the reduced stem 24, :andas lshown lll'Fig. t is'fprovideduwith'the' curvedcuts v 27 which provide when the-respective tions have the points 29 bent ftowardl the fixed sparking terminal 30, the spaces, 28, which permit any lubricant carried in the charge to be drained therefrom; v

The edge 31 of the casing. 7 cooperates with the wall of the'bore of the bushing 1 as the casing is inserted and Withdrawn to remove any collection of carbon; the exterior of the reduced end of the the lower end of the casing 7 are a plurality of spiral grooves32 to drainany oil that; .may enter in the space between the bushing 1 andcasing 7, and especially when the pres-" ent plug is used in a horizontal position.

The stem 23 is properly held in place by means of the metal cap 33, the resilient washer 34: and the nut 35, a terminal attaching nut 36 being also provided.

The gasket 37 ispreferably made from sheet copper or other similar malleable metal an incases a filling38 of heat .esisting material'such as asbestos.

casing 7 fitting snugly within the bushing 1. Provided upon whereby a casing 7 carrying an insulator and sparking portions may be readily 're f .--From foregoing description taken in connection with thedrawing it is evldent that 'this construction provides a means 7 moved from the supporting bushing for cleaning, and that by reason of the fact that the chamber thereof is accessible through the side the collection of carbon'upon the lower endof the insulator and the electrode carried thereby may be'thoroughly cleansed without disturbingtherelative adjustment 1 of the parts. It: isalso apparent that bycutting 1's 1,

plurality. of sharper ithan-in my forme -f;, ore' better sparking 1;={ 'It iS'E'alSQ'hPParenti that greater strength at the 25119 Qrtnig-portion of the separated the disk 25 as illustrated with a plurality of'spiraliradialincisions that a .jpointS 29 I are Iprovi'ded tent, and that therefacilities are secured.

pieces Ifoj' the-d sk 'is'hadas the base thereof adjacent therivet 26 is widened.

What I claim jas hew is 2- p 1. Asparkfplug including a supporting bushing, a" casingr-lnsertible therein and provided with ;a chamber,with an :opening through the wall thereof, said opening being norinally closed bylthe'supportingbushing, a; fixed electrode carrie' dillliorithe-lower bushm end-Tot thefcasing for "projection exteriorly hashing, an";insul ator carried within mfg and'h'a'ying the end therewithin posed throu' fithefo en ng;' and an adjustable electrode 'exten ing't rough the insulator and'ftheifcharii'ber of the casing to a point teriorly'oithe fixedelectrode.

v prfo'vi edjwith a smooth cy mdrlca bore, entaninsulator and sparkin terminal s foa' ing'casing insertible wit in said here and provided with a bore cleaning por- 1 park hi'gli-ncluding a su portin tion, the exterior of the casing being provided with a plurality of oil draining grooves opening at one end of the bushing;

3. A sparking plug includinga supporting bushing having an internal double diameteredportion providing a gasket receiving shoulder, a casing provided with a chamher having a reduced opening through one end, the exterior of the casing adjacent said end being provided with a cutting edge terminating in a frusto conical electrode, an in su-lator mounted in the casing, a stem carried by the insulator. and projecting through the reduced opening below the electrode, and a disk electrode provided with a plurality of spirally cut radlal incisions forming a plurality of Sparking terminals and oil outlets. 4. A sparking plug including a supporting bushing having an internal double diametered-portion providing a gasket receiving' shoulder, I a casing provided with chamber havingm reduced opening through a one end, the exterior of the casing adjacent said end being provided with a cutting edge terminating in a frusto conical'electrode, an insulator mounted in the casing, a stem carried by the insulator and projecting through the reduced opening below the electrode, and a disk electrode provided with a plurality of spirally cut radial incisions forming a plurality of sparking terminals and oil outlets, said casing being provided with a relatively large opening through the wall thereof to expose the interior thereof and the sulator for cleaning. p

In testimony whereofI afiix my signature.

noun M. WALTON, Witnesses; 1 e

' JOHN F. 'BEHR, J

- H. O. Coornn. 

